Luke Skywalker’s bionic hand is a step closer to reality for amputees in this galaxy. Researchers at the Georgia Institute of Technology have created an ultrasonic sensor that allows amputees to control each of their prosthetic fingers individually. It provides fine motor hand gestures that aren’t possible with current commercially available devices.
Three billion years ago, the sun shone weaker, but Earth stayed surprisingly warm. Carl Sagan thought a greenhouse effect must have been to thank for what was called the "faint young Sun paradox." A model built on 359 chemical processes has finally arrived at scenarios with a reasonable chance of producing enough methane to do the trick of warming a planet threatened by deep-freeze.